Simulation of Open- and Ducted-Rotor Noise Using CAA-Multidomain Method

Abstract

Abstract The sound field generated by an open rotor and that radiated by the same rotor placed inside a semi- infinite duct is simulated using a Computational Aeroacoustic (CAA) multi-domain method. The linearized Euler equations in cylindrical coordinates are used as governing equations in solving this problem. Both Tam's radiation and PML boundary conditions are used. Comparisons of results by using the two different far-field boundary conditions will be given. A multi-domain Cartesian grid system is used so that the number of grid points can be kept as a minimum. A combination of DRP and a specially optimized cell-centered high order differencing scheme is implemented in the area of two Cartesian grid interfaces. The effect of mean flow including a shear layer on the noise radiation off the ducted rotor is studied.

Open PDF

Document Details

Document Type
Technical Report
Publication Date
Feb 01, 2003
Accession Number
ADP014096

Entities

People

  • Jan W. Delfs
  • Jianping Yin

Tags

Communities of Interest

  • Air Platforms

DTIC Thesaurus Topics

  • Acoustic Waves
  • Acoustics
  • Aeroacoustics
  • Computational Fluid Dynamics
  • Computational Science
  • Equations
  • Euler Equations
  • Far Field
  • Flow
  • Fluid Dynamics
  • Frequency
  • Insensitive Explosives
  • Mach Number
  • Simulations
  • Three Dimensional
  • Turbulent Mixing
  • Two Dimensional

Readers

  • Acoustics.
  • Aerospace Engineering
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)